<template>
  <div class="login_container">
    <div class="login_box">
        <!-- 头像区 -->
        <div class="avatar_box">
            <img src="../assets/logo.png" alt="">
        </div>
        <!-- 登录表单区 -->
        <el-form :model="loginForm" :rules="rules" ref="ruleForm" label-width="0px" class="login_form">
            <!-- 用户名 -->
            <el-form-item prop="username">
                <el-input prefix-icon='el-icon-user' v-model="loginForm.username"></el-input>
            </el-form-item>
            <!-- 密码 -->
            <el-form-item prop="password">
                <el-input type='password' prefix-icon='el-icon-lock' v-model="loginForm.password"></el-input>
            </el-form-item>
            <!-- 登录 -->
            <el-form-item class="btns">
                <el-button type="primary" @click="submitForm('ruleForm')">登录</el-button>
                <el-button type="info" @click="resetForm('ruleForm')">重置</el-button>
            </el-form-item>
        </el-form>
    </div>
  </div>
</template>

<script>
export default {
    data() {
        return {
           loginForm: {
               username:'',
               password:''
           },
           // 表单的验证对象
           rules: {
                username: [
                    { required: true, message: '请输入用户名', trigger: 'blur' },
                    { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
                ],
                password: [
                    { required: true, message: '请输入密码', trigger: 'blur' },
                    { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
                ]
           }
        }
    },
    methods: {
        submitForm(formName) {
            //  valid参数 是布尔值
            this.$refs[formName].validate(async valid => {
                if (!valid) return;
                const { data: res } = await this.$http.post('login', this.loginForm)
                if(res.meta.status != 200) return this.$message.error('登录失败');
                this.$message.success('登录成功');
                // 1. 将登录成功之后的 token，保存到客户端的 sessionStorage中
                window.sessionStorage.setItem('token', res.data.token);
                //  1.1 项目中除了登录之外的其他API接口，必须在登录之后才能访问
                //  1.2 token 只应在当前网站打开期间生效，所以将token保存在sessionStorage中
                // 2. 通过编程式导航跳转到后台主页，路由地址是 /home
                this.$router.push('/home');
            });
        },
        // 重置表单
        resetForm(formName) {
            this.$refs[formName].resetFields();
        }
    }
};
</script>

<style lang="less" scoped>
.login_container {
    background-color: #2b4b6b;
    height: 100%;
}
.login_box {
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    .avatar_box {
        height: 130px;
        width: 130px;
        border: 1px solid #eee;
        border-radius: 50%;
        padding: 10px;
        box-shadow: 0 0 5px #ddd;
        position: absolute;
        left: 50%;
        transform: translate(-50%, -50%);
        background-color: #fff;
        img {
            width: 100%;
            height: 100%;
            border-radius: 50%;
            background-color: #eee;
        }
    }
}
.login_form{
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
}
.btns{
    display: flex;
    justify-content: flex-end;
}
</style>
